Metro is beautiful and elegant. It works wonders on my HTC HD7, and I'm pretty darn sure it's going to work just many wonders on tablets later this year. However, Microsoft also expects us to use Windows 8's Metro on our desktops with mice and keyboards - and in that scenario, I can't really see it work any wonders. The Verge user Sputnik8 decided to see what Metro would look like applied to a more regular desktop. The results are... Stunning.

Higher res screens didn't exactly disappear ...to a large degree they just remained very expensive, didn't follow the massive uptake of the "useless" ones, where people are perfectly happy with vertical 1080.
Stop whining, expecting them to finance your whims; go and buy a larger expensive screen (or, if you don't want to after all, wait a decade or two for the next step http://en.wikipedia.org/wiki/Ultra_High_Definition_Television ...unless of course you in turn plan to whine about it then)

Also, we can be pretty certain that at least MS puts lots of research into those new UIs; and it's not hard to discover empirically that cramming maximum number of info is actually a very bad idea (so perhaps the designers want to use the space to improve the legibility; also, read Edward Tufte ideas)